Final Exam 2 (20%)

Question

A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

Answer 1

Hidden content!
 ******  ** * * ** ****
  **  **  *******  

int main()
{
 *** *   * ***   char ** ** **
    ***     * int i,c=0;
 *    ******  *** *       * *  *   *   *   **
 *  *      ***** * * **   *    ** *   * * *  ***  
**** *    *  * ** *   *  ** *   ** **   
 ** *****   * {
** ** * ** **   ** ******** *** 
*   * *  **       * * ****** {
      *      *  *  * *   *      * **  **   *****   * *   *** * * *        
** ***  *  **     *** * **  ** **   **  ** ** ** * *   *  * *   {
 * *                 * ** **  **** c=0;
* ** **        * **  * ** ***  *** * *       * *       * *  }
*   ** *        *  ****    * ****   * ***    *  *  * else    *  * * * ** **  *   ***
 * **  **  **  * ****     **  *    * * **       *   *  **  * *  * {
**   **     ***  * ** ** *       *  ****   ** *** **  **   * *  ***** * *    c++;
* *   **   * **  * *   **   *    * ** ** * *  *  *  *   ** ** }
**** ** *** ***    *  *    * }
    *   * ** 
***       *    if(c==0)
  *** *    *** **  **   *  *  **  ****** *  is not a prefix of * *  *   * * **  
 ** *   *** ** * else
** *** *  **** **  ***   *   * *  *  ** *    ** *  is a prefix of * **     *** 
** ** *    *  }
***   *   ** * return 0;
}

Comments

prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 2

Hidden content!
  *  ** ** ***   
   *    *  * ** * **   
int main()
{
*       **    * ap;
 ** * **** **  *  **** *** ***         ***   || ap=a)
 ** ****  ** **   ***** * ** ********  *  is a prefix of abcde\n");
***  *  ****
**   **    ** 
***    * ****  *  **   *  *  **     *     is not a prefix of abcde");
***  **  * **  *** ** *** ** * **** *    *  *    ** *  * *** * ** *** * 0;
 *** *      * *    ***     **   ****       ** **  * **    *  ** ** * ** 
  

Comments

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

Answer 3

Hidden content!
    **   *  ** *  ** 
*   *  ** ***  ** ** *

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
*      *   * **   **  * *****  i<pl; i++)
  ***  **  * *** * **** * *  *
 *   **  **    **** * ****** *   *  ** * * ** **  * * * (p[i]==s[i])
**   ******     * **** * * * ** ***** ** * ***** *  * * 
* *   *** * * * ** * ******   **   ** * * * *   * **  *    * ** **   * * * *** *  *  ***      
  * ****  * *      **   * **  *** *   * *  **********  *  *****  *       ****   *
  ***  ** * * ** ** * * ** *   * * * ** * ** *   *  * * *  **  *   * * **  * **  *   *   ****   *** **           1;
   *  * * *** * ****  *  ** ***   ** * ***   *   * ** *      *  *  ** *  ** * * **    * 
********  ** *  * * ** *** **   *   **  ****  **   *******
***  * *     *   *     **** **    ***  *  ** **  * **  if(p[i]!=s[i])
* **  *******       *  ** * ** **    *  **** * *  * *
   *   *  **  **   ***   * **  *   **   *** ** *   **  * *    *   *****   ****   * ** 0;
   *** *  *    * ***  * *** *******  ****   *  * ****  
 *  * *    *  *****  * **** 
}


int main()
{
**    ********  *
 ****   **   **** 
*** **** * * * ",p);
* *   * * ** *  ****   
**  * **** * * * ****   

sl=strlen(s);
pl=strlen(p);


 *       *  ** && pl<sl)
{

* ** ***  **   *  * *****  * **  ** *  * **  is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}

Comments

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 4

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
*        * ***   *   **   * a[99],b[99];
    int l,i;
  *** *  *****  * *** **   ***    
 * ** *  *   ** *  *  * *  *     *
**   *  *       *   * * *** *   * *
   ** ** *   ** * ** * *** ****   *  *      *
    {
****  * *** *  *       * **   *  *****   *  ** *  * *  ** ***
   * * ******  * *        *******  * *  *     *  * **  *  ** 
**** **  *  *    *   ***    ** *** ****  *    *   *    ***   ***** * * ****  ***     ***  ** ** a prefix of %s",a,b);
  *   ***  **********    ***  * * *  * * *         ** **  *** * ******* * *  *  * 
*** * *  ** *  *    *   ****** *** *** * ****   *  * *  
****  *  ***  *** *** * **  *   ****   ***   *  ****   *  **
   *  *     *     **  ** *** * *** *  * ** *  *  ****    
 *  **  *   *   *** **  **   *** *    ******* * *   * ****   ***  **  *** ****  *      * **** **  not a prefix of %s",a,b);
     * ** *  ** * **  ***** *  ************* ***  *  ********     * *** * * *       
 **  * * *   **    * *         *   *** *   **  **    *** *
    }


}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 5

Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
* *  **  **   * ** ***    * *   *  i;
* *** * *   ****  **     *  **    count=0;
***   **  *  *  * *****   *** *** len;

* ***    * ** ***  *  *   **   *  *  

* ** ******  * ** ** ** **  *   * ****    *** *
  **** *** *****  *  * **
*  *** *  **   *  * ****** ** *  ****** * ***   * **   * * * 
** ****               **   *****   **   *** *  **** ***  *
* *****  *    ** ** *** * *   * ***  *  ***   ** *  *  *   *** ** **    **  * * ***** 
   **  ** *  *** **** * ***  ***  *  * ** ** **     ** 
*    ****  **** * **     


 *    *   *  ** ****  *    ***** *  ******* 
*********    *  *  *  ***** ** *  
 * * **  ** * ***  *  **  * *  *  ** * * * *  **  **    *   1;
**  * * ** *   ** *   *    
*  *  *  ** * *******  *** *** **  

   return 0;
}


int main()
{
  *  *** ***** *** * *** **** a[100];
     *** *   * ****   *    * **** b[100];


 *   *** * ** **  * **  * ***     ** *     ** * ** *   *     * *
*   *  * *   *** * **   **   ** *** ****  *  *    **    

*        * * **   *  ***  ****  *  ***** *** *** **
 **** ******** ** *  ******* * * **     **

* *  *      ***** *** * * ***  **  

 {
**  **      * *     ** *  ** *  **** *  ****    *   * ** *  **** ** * is a prefix of %s",a,b);
**** *      * *    ****** * * 
**  *  *  *** * *** ***
 *** ****  ***   ***** *  ***** 
*  ***  * ***** ******** ** * ***** *   ***    ****  *     **** * *  is not a prefix of %s",a,b);
***   *  ****  * ****  *   *   


 * ** **** *     *  ** * **    ** 0;
}

Comments

prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 6

Hidden content!
* *   * *** *     *   **
*  *    * **  ***  

int ** 
{
** *   ************   **  * *** * *    *  no idea, I     even do it in the *     ** ** **** 
** * *  *  * * ** ** ***** * * * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 7

Hidden content!
#include  *   **   *** *   
#include **     *  
#include * * * * ***   **

int pref(char[],char[]);

int main(){

 **     *** ****  ** **  ** ***   * p[10],s[10];
***  ** ****   **  * *      ** num;

**  * *  **     * **    **  * * * **   
 **  **      * ** ****** *  ** ** 
* ** *  ***   * ***     *   ***** *** *  * ** * * 
   *  * ** *  *  ** * * ****  ***  *   ***   *** *** **   *****

*  ** *** * ***** *        * = pref(p,s);

** * *  ***** *    *****  ** * 
** ***  ***  ****** ** ***   * ****  *     ***   *  * *  *   is a prefix of %s",p,s);
******   *  *  **** * ***       *  
** * *** *   *  * ****  * **    *** *******  **   *  **     * *   **   is not a prefix of %s",p,s);


 return 0;
}

int pref(char p[30],char s[30]){
    *  *  * * * **  *   * * ** i;

**** *   *******  * **    *   * **  * * *  **  
*  ***   *  * * ** ** **     *  ** * **   * **  * ** ***  *       *  **    **  *  ** **  ***  ** 
*    ****   **  *   * ** *  * *  *  * *  ***       ** * ***  *** *****   **** ***  *  * *    ** * **     * is a prefix of %s",p,s);
   * *  **** ** * * *  ** ***    ** ** * * *   ** **  *  
* ** ** * * **  ** **** *  *  * *     **    ** **** ** *****  * **** ** **  ** **  ****  ***  *    * is not a prefix of %s",p,s);

  * ** ** *  *      ****** * **

}

Comments

prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.

---

prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~

---

prog.c: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^

Answer 8

Hidden content!
**    ***  * **  * ** *** *
*  *     *  **** **  

int main()
{
 * ** *** length1,  *    c;
****  *  a[100];
 * * **   *  b[100];
   ** * *   ** d[100];

* **   **** *      ****   *   *   **
** * *   * * ***   * *  **** *   **   **

**** *        * ** * *

  *       **  **** 

  * * * * **  ***
 ** *** *
   *     **  * * **  * *   * **  is a prefix of * **** *  *
* *  *  *
*  *  * *** *
    **  *
* * *****      **   * is not a prefix of *    **** 
   ** *  * 

}

Comments

prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^

Answer 9

Hidden content!
*  * *   **  *** *  *    
*  ** * ********** *  * 

int main()
{
 ****    *       *  *  ***  *  * str;
 **  ******** * ** * *** * i, p, s;

 ****   * * *  ** ** **  ** ** ***  * *  ***  *  ** &p, &s);

 *         * * *** *   * * (i<=0; &p; i++);
**  * ****  **  ***   * *   **  
******    ****     ** *  * **  *  *  * **        &p);
*   * *** ** **  *  ******    ** *** **       ***   *
    **  *  * *    * **   ** **  *
*** *   **     ****** * **   ****

** **     * **   * *   **     ** ** * 0;
}

Comments

prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^

Answer 10

Hidden content!
 **    ****  * *
***    * *  **** *     
int main (){
char   *  ** *
char **  *
*    **   ** *     **   *** 
   **   **   *** * * **  * ***     *
* *       **  * **  *  ** *  * 
    *    ** **  * *    ***  ** *
  * ******    ***  *
* *  *   **  is a prefix of ***   *   **    **
}
else{
* ***   *      is not a prefix of %s **     **  *  * * 
}
 *** 0;
}

Comments

prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^